Date: Sun, 26 Jan 1997 12:44:35 +0200 From: Nadav Eiron <nadav@barcode.co.il> To: "Eric J. Schwertfeger" <ejs@bfd.com> Cc: questions@freebsd.org Subject: Re: SCSI Controller suggestions? Message-ID: <32EB3593.566D@barcode.co.il> References: <Pine.BSF.3.95.970124171213.18358A-100000@harlie>
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Eric J. Schwertfeger wrote: > [snip] > > I'm favoring the AHA2940 family, mostly because we already have two > FreeBSD machines running them(Identified as <Adaptec 2940 SCSI host > adapter> rev 0, not sure what that makes them), and I'd like to keep them > all the same. > > I've heard that unless bus saturation is important, the U and UW are > actually slower than the base model, something to due with how many > outstanding commands can be queued, if I remember correctly. I'm > currently favoring the AHA2940 for this reason. You are probably referring to the difference between the A variants (2940A, 2940AU) and the straight 2940. The 2940 can have 16 SCBs while the A variants have only 3. I don't think it will make much of a difference when you have just a single disk on the bus, but it has nothing to do with the U or UW variants. > > Also, the cpu this will be on is a P6/150 w/64M Ram. Why? Not because > it needs it, but because at $520 for cpu and motherboard, it's cheaper > than a P5/166 and motherboard). > > Anyway, does anyone with more SCSI experience care to comment on the > direction I'm going? Nadav
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